THE PERSPECTIVE OF BEHAVIOURISM

Transcription

1 THE PERSPECTIVE OF BEHAVIOURISM The roots of behaviourism can be found in the philosophical ideas of Associationism, which is the study of how ideas get linked together, and trying to find laws that describe and explain behaviour. Some key theorists used Associationism to explain learning. This principle of Associationism put simply is the study of how ideas get linked together, and trying to find rules or laws that describe and/or explain behaviour. Some key phycologists used associationism to explain learning, which is a central topic to psychology. What is learning? Learning is a relatively permanent change in behaviour due to experience. Note: Relatively permanent excludes temporary changes such as illness, tiredness, getting drunk. Experience excludes changes due to genetic inheritance, maturation, permanent injury etc. 1

2 Classical Conditioning Ivan Pavlov ( ) a Russian psychologist who founded the institute of experimental medicine in 1890 studied digestion. He published lectures on the work of the digestive glands in The dog was harnessed in a soundproof, smell proof cubicle, so it could not see, hear, or smell the assistants. A bell was rung (so the dog could hear it) when food was given, and the amount of salivation was measured. After several trials, the sound was made without food but the dog still salivates. In this way Pavlov conditioned the dog to salivate whenever the sound was made. A learned response. Pavlov found that when the Conditioned Stimulus (sound) was presented regularly without the Unconditioned stimulus (food) the Conditioned response (salivation) gradually ceased. This relates to stimulus response theory also known as cause and effect. Cause/stimulus Response/effect In further experiments Pavlov found that when the CS (sound) was presented repeatedly without US (food), the CR (salivation) gradually ceased. After a day or two, when the CS (sound) was presented again, the CR (salivation) would start again, even though no US (food) was presented. This was spontaneous recovery. What is the use of getting a dog to dribble? These experiments are extremely important for two reasons: Classical conditioning explains virtually all learning that involves reflexes, heart rate, muscle-tension etc. Since the above reflexes are signs of excitement, including fear and sex, they may explain unusual and undesirable behaviour, e.g phobias and sexual deviation. Consequently, classical conditioning is the basis of behaviour therapies, some include: DESENSITIZATION THERAPY Developed by J. Wolpe, 1958 This is based on gradually reducing the bond the stimulus and the response. E.g. fear of spiders, by slowly introducing the spider and getting the phobic to relax. COUNTER CONDITIONING Therapy can alternatively be based on replacing the S-R BIND either a new bond. E.g. replacing the spider-fear with spider-happy, by introducing something pleasant such as food along with the spider. AVERSION THERAPY There is also replacing one bond with another, but here replacing nice with nasty e.g. to stop habits such as smoking or alcoholism or to treat more undesirable behaviour such as paedophilia, sadism or masochism. 2

3 Thorndike & Connectionism. Just before Pavlov was working in the USSR, Edward Thorndike in the USA ( ) was independently working on connectionism another form of associationism. He tested cats, timing how long it took each one to escape from a puzzle box. A cage with a pull-cord inside that unlocks the door. The first time the cat escaped by trial and error, trying various actions, until it accidentally pressed the lever. After several trials, it would soon associate pressing the lever with escaping. Thorndike found that the cats would initially take some time to escape, but with practice they soon learned to get out quickly. The first time the cat escaped by trial and error, trying various actions, until it accidentally pressed the lever. After several trials, it world soon associate pressing the lever with escaping. Thorndike found that, on average, cats would initially take some time to escape, but with practice they soon learned to get out quickly. Thorndike plotted the time for the cats to escape on a graph, producing a learning curve. As steep leaning curve means that the learner has learned quickly. Thorndike produced two laws of learning: The law of exercise repetition strengthens learning (Practice makes perfect). Learning the lines of a play, maths tables by repetition is called rote learning or parrot fashion. The Law of effect the effect of reward is to strengthen learning. Or if it is pleasurable it will be repeated. Thorndike found that reward was more effective than mere repetition. 3

4 Skinners behaviourism Operant conditioning. Skinner Burrhus Frederick Skinner ( ) studied voluntary behaviour in contrast to Pavlov s study of reflex. Skinner invented an operant conditioning apparatus (nicknamed the skinner box). The experiment a hungry rat is placed in the box with a lever attached to a food dispenser. Eventually the rat hits the lever by accident; as a result the rat makes a connection between the lever and food being dispensed. Further experimentation showed that the time it took between the rat pressing the lever and the time that the food was dispensed determined the frequency with which the rat would hit the lever. In other words instant reward for behaviour provided more frequent behaviour. Positive reinforcement. This was different to Pavlov s study of classical conditioning of the reflexes, skinner studied non-reflexive or voluntary behaviour. Skinners studies found that the optimum period of response and reinforcement is about half a second or almost immediately. This is important. If a parent wants to reward or punish a child, then to be effective it should be done straight away. This might also explains one reason why the penal system often doesn t work. The delay between committing a crime being arrested and being convicted in court may be far too slow. According to skinner another reason why punishment doesn t always work is that punishment causes slower & less learned responses than does positive reinforcement. The carrot is more effective than the stick! Punishment often causes the individual to avoid being punished rather than stop the undesirable behaviour. Punishment can cause the individual to associate punishment with the punisher, rather than the behaviour. Punishment may train and individual about what not to do, but it doesn t train what to do. Skinner found that many people (parent, teachers, judges.) make false assumptions about what is reward and punishment. So-called rewards can have the opposite effect. As a reward for her good homework Mary will read aloud her essay for all of you to hear how clever she is. This reward may bring resentment and ridicule from her classmates. Now Jimmy stop doing that and get on your work. Negative attention may be what Jimmy is seeking. According to skinner each individual has his/her own needs. Therefore which reinforcement will work or not must be found by experimenting with that particular animal or person. 4

5 Definitions Positive reinforcement is when there s an increase in behaviour by receiving anything that is pleasant or perceived t be reward. E.g. food pellets for hungry rat. Negative reinforcement is when there s an increase in behaviour by avoiding something unpleasant. E.g rat pressing lever to avoid a mild electric shock. Punishment is when there s a decrease in behaviour by anything that is unpleasant. Putting it into practice Skinner realised that a lot of so-called problem or naughty children were really just normal, healthy, active children who had frequently been inadvertently mis-trained by their parents, teachers, etc. Even if the child is always good which often means, quiet and inactive which is not necessarily healthy), then it may grow up to be neurotic (scared to do anything). The 3 stage training method. Ideally all children should be trained correctly in the first place. He devised a simple system that he found to be effective on animals and humans 1. Define the goal (wanted behaviour) E.g Getting the dog to bark when it sees someone at the window. 2. Define the start (entering the behaviour) 3. Positively reinforce each step (increment) in the desired direction while ignoring all other (unwanted) behaviour. This is used to train guard dos, police dogs and guide dogs. Based on this simple approach skinner devised a method for changing behaviour. Behaviour modification Skinner argued that some children and adults need to have their behaviour modified to fit into society and lead happier more fulfilled lives. With children it is usually a matter of changing the parents behaviour as much as the child s. The psychologist typically begins by helping the parents decide a specifically what types of behaviours are desirable and what are not. Next a decision is made about what positive reinforcement to give, what to ignore and if necessary what to punish. The key is consistency, always reinforcing a particular behaviour in the same way. SKINNER CONTRIBUTION TO EDUCATION Skinners 3 stage method has been applied not just to training but to education generally. Teachers decide what they want each child to achieve. They write down behaviour objectives. Example. By the end of this course you will be able to: State a simple definition of psychology Describe 3 types of work done by psychologists Contrast psychology with psychiatry List at east 7 famous psychologists The verbs must be measurable, nothing vague like understand, know, grasp, comprehend. Stating objectives is also useful for individuals deciding on their own personal goals. 5

6 Social Learning Theory Not everyone agreed with Watson & skinners radical behaviourism - that all behaviour could be explained by stimulus, response & reinforcement. It s also important to consider mental (cognitive processes. Julian Rotter (b. 1916) invented the term social learning theory in 1947 when studying social interactions in laboratory conditions. In his view humans have expectations about the effects their behaviour, the kind of reinforcement they get. People also have individual values that they apply to their behaviour and the reinforcement they receive. An important question for Rotter is where is your locus of control? There are basically two types of people depending on their upbringing: Internal locus of control people believe that reinforcement depends on personal efforts. They think they are in charge of their lives and acting accordingly. They are physically & mentally healthier and more socially skilled. Their parents are supportive, generous with praise, consistent with discipline and non-authoritarian. External locus of control people believes that reinforcement depends on outside sources. Everything is beyond their control, so they make fewer attempts at improving their lives. Albert Bandura (b 1925) developed a version of behaviourism in the early 1960 s, initially called socio-behavourism and then social cognitive theory. Behaviour doesn t always have to be directly reinforced for it to occur. We can learn through simply observing others and seeing the consequences of their actions. This important second-hand learning is called observational learning. In a simple experiment, Bandura (1963) used two groups of children. 1. The experimental group saw an adult in a room full of toys being violent to an inflatable doll. 2. The control group saw an adult playing non-violently. Each child was then left alone in the toy-room and observed on film. Without any direct encouragement the experimental group performed significantly more aggressive acts than that of the control group. The conclusion was that children will spontaneously imitate the behaviour of a model, without any obvious reinforcement. 6

7 This was also an early demonstration that children will specifically imitate violence. Subsequent variations by Bandura showing realistic and cartoon aggression on film clearly showed that children can be strongly influenced by violence on T.V. and in cinemas. Note that these experiments did not measure long-term effects. The processes of imitation and modelling have also been important in therapy. MODELLING Like skinner, Bandura applied his work to practical problems like modifying abnormal and undesirable behaviour. The therapists act as a model showing particular patient how to behave. Example. An arachnaphobic is shown how to catch a spider by placing glass over it then sliding a piece of paper underneath. Modelling can be used to treat phobias, obsessive-compulsive disorders, anxieties etc. Education and training can also benefit. The teacher or trainer acts as a model for the students. Behaviourism, therefore did eventually become less mechanistic, and more cognitive-sometimes called neobehaviourism. 7